Answer:
== Installing a Toilet on a Cast ==Yes, you can put a toilet on it. The hardest part would be putting a toilet flange onto the cast. There are two options: you can either get a cast iron flange to fit over it and pour a lead joint or you have to chip around the pipe enough to get a no hub band on it. You also have to consider the distance from the wall. If it's 15" to the back wall you only need a minimum of 12" to finished wall. That means if you fur the wall out you could only fur it out 2.5" leaving you with 1/2" drywall. The side of your toilet needs a minimum of 15".Here is more input from others:* Go to your plumbing or hardware store. There you'll find a brass flange you can fasten to the floor with zamma pins. You will not need to chisel the floor with this method, but, you will need ensure the 4" is flush to the floor. A hammer drill is also needed to drill six 1/4" holes in the cement for the zamma pins.* In order to ensure the proper safe and sanitary conditions of your plumbing system it is recommended that you hire a licensed plumber to do this type of work. If the floor of your basement is concrete it will have to be jackhammered to expose the cast iron pipe under the floor. The pipe will have to be cut using proper tools. Cast iron pipes are hard and brittle at the same time and if they are old and corroded will often crack. A proper fitting will have to be installed and fastened with right couplings to be water tight. Plastic ABS 4" pipe is then installed vertically though the floor just above the floor level and proper distance from the wall in back of the toilet, capped and wrapped to accommodate the floor flange after the concrete is poured back. When the concrete dries the cap and wrapping are removed, the ABS pipe is cut flush with the floor and toilet floor flange is installed.* You may be able to add a toilet to the line but it must be properly vented!*Another option, and probably the easiest for a homeowner, is to buy what is called a "twist and set flange". It is basically a PVC flange with a longer base that has 2 rubber seals that actually thread into the cast iron pipe. You would insert the base of the flange into the pipe and turn it until it becomes firm, then I would suggest anchoring it to the floor with 1/4" drive pins, or some other form of anchor.